Decompression Theory & Rdp

Front 1

The individual credited with developing the basic decompression model used in most dive table and computers today is:

Back 1

John Scott Haldane

Front 2

The Haldanean model consists of several ______, each with a _____ in minutes that represent how fast it absorbs and releases nitrogen, and a(n) _____ that sets the maximum nitrogen pressure it can have when a diver surfaces.

Back 2

Compartments, halftimes, M-value

Front 3

A 60-minute tissue compartment requires ______ to fill or empty completely, while a 120-minute compartment requires _____.

Back 3

6 hours, 12 hours

Front 4

There is _____ relationship between the Haldanean model and the human body; you can rely it only as far as it is supported by ____.

Back 4

No direct, test and field data

Front 5

What is Actual bottom time?

Back 5

Used in repetitive diving and added to Residual Nitrogen Time equal to Total Bottom Time

Front 6

What is Adjusted no decompression limit?

Back 6

The time limit for a repetitive dive that accounts for residual nitrogen remaining in your body form a previous dive

Front 7

What is Bottom time?

Back 7

The time from the beginning of descent until the beginning a direct continuous ascent to the surface or safety stop

Front 8

What is Total Bottom time?

Back 8

The sum of Residual Nitrogen time and Actual Bottom Time of a repetitive dive used on Table 1 of the RDP Table to determine the pressure group following the repetitive dive

Front 9

What is Surface Interval?

Back 9

The time spent on the surface between two dives – usually recorded in hours: minutes

Front 10

What is Residual Nitrogen time?

Back 10

An amount of nitrogen, expressed in minutes, for a specific depth added to the actual bottom time of a dive to account for residual nitrogen from a previous dive

Front 11

What is Safety Stop?

Back 11

A stop usually at 5meters/15 feet for three or more minutes at the end of a dive for additional safety

Front 12

What is Residual Nitrogen?

Back 12

The higher than normal amount of nitrogen remaining in your body after a dive

Front 13

What is Pressure Group?

Back 13

A letter used on the Recreational Dive Planner to designate the amount of theoretical residual nitrogen in your body

Front 14

What is Repetitive dive?

Back 14

A dive that follows another while there is still residual nitrogen in your body

Front 15

What is No Stop Dive?

Back 15

A dive made within no decompression limits because you don’t have any required emergency stops

Front 16

What is Ascent Rate?

Back 16

The proper speed for ascending, which is not faster than 18meters/60 feet per minute

Front 17

What is No Decompression Limit?

Back 17

The maximum time that can be spent at a depth before decompression stops are required

Front 18

The early versions of the US Navy tables were the standard for recreational diving because:

Back 18

they were widely available, many early divers were former military divers who used them already, and before the rise of computers, it was beyond the piratical abilities of most people to develop a table

Front 19

The basis of surface interval credit with the 1950’s version of the US Navy table is the _____ minute compartment.

Back 19

120

Front 20

The US Navy selected the 120-minute tissue compartment to control their “Surface Interval Credit Table” because:

Back 20

they were designing table that enabled decompression diving

Front 21

The RDP uses a different basis for repetitive diving from that used by the 1950s US Navy table because:

Back 21

surface interval credit can be less restrictive when limited to no decompression diving

Front 22

The 60 minute halftime surface interval credit of the RDP gives approximately ________ the surface interval credit of the 1950s version of the US Navy tables.

Back 22

Double

Front 23

Why were the WX and YZ rules created for RDP?

Back 23

Analysis found that a compartment slower than 60 minutes could control a repetitive dive for a small portion of no stop dives involving long shallow multiple dive profiles

Front 24

The RDP was developed for ____ divers. Its test included ____ divers, a wider range of _____ and _____type.

Back 24

Recreational, female, age, physical

Front 25

Why can’t pressure groups from the RDP be used on the US Navy table or any other tables?

Back 25

The tables are based on different decompression models

Front 26

Match the version of the RDP with its name:

Back 26

Traditional RDP, Enriched Air RDP and eRDPML

Front 27

A dive computer provides more no decompression time than a table because:

Back 27

it eliminates unnecessary rounding by calculating the dive exactly

Front 28

A dive computer:

Back 28

follows the same theoretical basis as dive tables, calls for following the same general recommendations as when diving with tables and should not be shared by 2 or more divers on a dive

Front 29

Which decompression models are commonly used in dive computer?

Back 29

Buhlmann limits –EE washout & Spencer Limits – 60 minute washout

Front 30

Some dive computers have added adjustments that reduce dive time or mandate safety/decompression stops:

Back 30

if you exceed a safe ascent rate, if the water is cold or if you make short surface intervals

Front 31

Most RDP special rules, recommendations and considerations come entirely from ________.

Back 31

What diving found to work, whether they have any basis in a decompression model or not

Front 32

An in-depth understanding of all the special rules, recommendations, and considerations can help you _____.

Back 32

Avoid decompression sickness

Front 33

Which of the following are recommendations or rules for RDP use?

Back 33

Make deeper dives before shallower dives, make safety stops at the end of all dives, plan cold/strenuous dives as if they are 4 meters/10 feet deeper than actual, and allow at least 12 hours after diving before flying

Front 34

When diving with a computer:

Back 34

follow the recommendations that apply to dive table, don’t share it with a buddy, and follow manufacturer recommendations

Front 35

With the RDP, if you are planning 3 or more dives in a day, beginning with the first dive, if you ending pressure group after any dive is W or X, the minimum surface interval between all subsequent dives is _______.

Back 35

1 hour

Front 36

When using the RDP, limit repetitive dives to:

Back 36

30 meters/100 feet or shallower

Front 37

The 42meters/140 foot designation on the Recreational Dive Planner is for ______.

Back 37

Emergency purposes only; do not dive deeper than 40 meters/130 feet

Front 38

RDP procedures REAUIRE a safety stop:

Back 38

On any dive to 30metes/100feet or deeper, on any dive that comes within three Pressure Groups of a no decompression limit, and on any dive that reaches RDP limit

Front 39

If you discover you have accidentally descended below 40 meters/130 feet, immediately _________.

Back 39

Ascend to 5meter/15 feet, make an emergency decompression stop for 8 minutes and do not dive again for 6 hours

Front 40

If while at depth, you discover that you have exceeded a not decompression limit on the RDP by 5 minutes or less you should _________.

Back 40

Make an emergency decompression stop for 8 minutes at 5meter/15 feet prior to surfacing, then remain out of the water at least 6 hours prior to making another dive

Front 41

You need to follow special dive table and computer procedures at altitude (where there is _____ atmospheric pressure) because decompression model were developed for ______.

Back 41

Less/sea level

Front 42

Using the RDP above ______ requires the use of special procedures including the conversion of actual depth to theoretical depth. To use theoretical depth tables you must know the _______.

Back 42

1000 feet/ altitude of the dive

Front 43

At about ____ above sea level, atmospheric pressure drops enough to question the accuracy of calculations intended for sea level. Diving ______ this altitude without following proper altitude procedures increases the risk of decompression sickness.

Back 43

300 meters/100 feet & above

Front 44

You may use the RDP to plan dives to a maximum altitude of _______.

Back 44

3,000meters/10,000feet

Front 45

When making an altitude dive, the ascent rate is ______ per minute or slower.

Back 45

9 meters/30 feet

Front 46

Make no more than __ dives per day while altitude diving, and don’t mix altitudes by making the repetitive dive at a ____ altitude than the first dive.

Back 46

Two/higher

Front 47

A diver plans an altitude dive at 2286meters/7500feet. What is the divers’ pressure group upon arrival at the dive site altitude?

Back 47

P

Front 48

A diver plans to dive at an altitude of 2150meters/7053 feet to an actual depth of 25 meters/65 feet. What is the depth used on the RDP for planning this dive?

Back 48

35 meters/94 feet

Front 49

IF you make a single no decompression dive at sea level, it is suggested that you minimum preflight surface interval be:

Back 49

12 hours

Front 50

Using the RDP above ______ requires the use of special procedures including the conversion of actual depth to theoretical depth. TO use theoretical depth tables, you must know ____.

Back 50

300meters/1000feet & altitude of the dive

Front 51

Flying after diving recommendations suggest that divers wait __ hours after completing a single dive and __ hours after completing multiple dives for several days before flying in a commercial jet airliner.

Back 51

12/18

Front 52

In a decompression model, the rate at which a theoretical tissue absorbs and releases nitrogen is called its:

Back 52

halftime

Front 53

You can rely on Haldanean decompression model:

Back 53

only as far as it has been shown to work in tests and by field experience

Front 54

The US Navy tables were the standard for recreational diving at one time because:

Back 54

many years ago, recreational divers and instructors came from military and merely adopted them for use

Front 55

If a diver exceeded the no decompression limit for a dive by 5 minutes, but didn’t realize it until after surfacing and boarding the dive boat, what procedures would the diver follow?

Back 55

Remain on the surface, rest and be monitored for signs/symptoms of decompression sickness; wait at least 24 hours before diving again

Front 56

The US Navy table repetitive dive credit is based on a ____, and the RDP’s repetitive dive credit is based on a _____.

Back 56

120 minute half time/60 minute halftime

Front 57

The effect of RDP’s repetitive control compared to the US Navy table’s is that the RDP:

Back 57

gives approximately twice the credit for a given surface interval

Front 58

A dive computer provides more no-decompression time than a table because:

Back 58

it eliminates unnecessary rounding by calculating the dive exactly

Front 59

A dive computer:

Back 59

follows the same theoretical basis as dive table, calls for following the same general recommendations as when diving with tables, and should not be shared by two or more divers on a dive

Front 60

You cannot interchange Pressure Groups from the RDP with those of the US Navy table or other tables, or vice versa, because:

Back 60

the tables are based on different models and the letter designations represent different theoretical nitrogen levels

Front 61

The RDP model is characterized by:

Back 61

14 compartments and a 60 minute surface interval washout

Front 62

Using the RDP table, you plan to make two dives, the first to 40m/130ft and the second to 12m/40ft. What is the no decompression limit for the first dive? Assuming your first dive is for 9 minutes and you have a one hour, 30 minute surface interval, what is the no decompression limit for the second dive?

Back 62

10 minutes/124 minutes

Front 63

Using the RDP table, you plan to make three dives. The first will be to 29meters/95 feet for 15 minutes, followed by a one hour, 45 minute surface interval. The second will be to 21m/67ft for 20 minutes. If this is followed by a 52 minute surface interval, what is the no decompression limit for a repetitive dive to 21m/67 ft.?

Back 63

25 minutes

Front 64

Using the RDP table, what is the minimum surface interval required between a dive to 16m/50ft for 60 minutes, followed by a second dive to 14m/40ft for 70 minutes?

Back 64

11 minutes

Front 65

Using the eRDPML, what is the no decompression limit for a dive28m/95ft?

Back 65

22 minutes (planning mode)

Front 66

Using the eRDPML, you plan to make two dives. The first dive will be to 28m/95 ft for 14 minutes, followed by a one hour, 30 minute surface interval. The second dive will be to 12m/40ft. What is the no decompression limit for the second dive?

Back 66

124 minutes (planning mode)

Front 67

Using the eRDPML, you’re planning a two-level multilevel dive. You plan to spend 18 minutes at your first level of 29m/92ft and then ascend to 20m/65ft for the remainder of the dive. What is the maximum time you can spend at you second depth level?

Back 67

11 minutes (planning mode w/multilevel dive)

Front 68

Using the eRDPML, you plan to make three dives. The first will be to 19m/63 ft for 30 minutes, followed by a 30 minute surface interval. The second will be to 15m/54ft for 27 minutes. If this is followed by a one hour, 40 minute surface interval, what is the on decompression limit for a repetitive dive to 14m/48 ft?

Back 68

63 minutes (planning mode)

Front 69

Using the eRDPML, you have just made two dives, the first to 29m/98ft for 12 minutes, and the second to 23m/59ft for 20 minutes, with a 42 minute surface interval between them. What is the minimum required surface interval for a third dive to 15m/54 ft for 40 minutes?

Back 69

31 minutes (dive planning & surface interval)